package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> uploadSomething(MultipartFile file) {

        log.info("传输请求进来喽!{}",file);

        //获取到原始文件名称
        String originalFilename = file.getOriginalFilename();
        //截取到文件后缀名称 .XXX
        String fileTailName = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID随机生成文件名 + 截取到的后缀名
        String newFileName = UUID.randomUUID().toString() + fileTailName;
        //使用File对象首先标注一个目录
        File catalogue = new File(basePath);
        //判断如果当前目录不存在则创建
        if (!catalogue.exists()) {
            catalogue.mkdirs();
        }
        //标注目录+文件名
        File finalFile = new File(catalogue +"\\"+ newFileName);

        //使用MultipartFile对象进行传输
        try {
            file.transferTo(finalFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(newFileName);
    }


    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
